The build was leaked to every branch including Fast, Slow, Release Preview ring and Current Branch phones and PCs. Windows 10 users at current branch with 32-bit version of the OS also received update 15063.2.rs2_release_svc_d.170531-1743 (UUP-CTv2) in their updates. To download this build click here.

It is highly recommended that you do not install it on your main system. The build is too buggy and hangs frequently. Of course, there is no official changelog for this build.

You can download the Windows 10 Build 16212 ISO from the link below. Currently, the ISO image is available in 32-bit only. You can also create bootable USB disk with this build 16212.1001 ISO. Read more here.